Alfred a



A. A. HULL. WRENCH.

(N 0 Model.

1%. 501,462. Patntefi July 11, 1893.

UNITED STATES PATENT OFFICE.

ALFRED AJ-IULL, OF KNOXVILLE, TENNESSEE, ASSIGNOR or ONE-HALF TO JAMES ADKINSON, OF SAME PLAoE.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 501,462, dated July 11, 1893. Application filed December 2], 1892. Serial No. 455,928. (No model.)

To aZZ whom it may concern:

Be it known that I, ALFRED A. HULL, a citizen of the United States, residing at Knoxville, in the county. of Knox and State of Tennessee, have invented certain new anduseful Improvements in Wrenches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to Wrenches, and it has for its objects, among others, to provide an improved wrench of few parts and capable of quick adjustment and not liable to get out of order.

The nature of the invention consists of a certain new construction and arrangement of the various parts as will be fully described in the specification and pointed out in the claims, reference being had to the accompanying drawings wherein Figure 1 is a side elevation showing the wrench ready to be adjusted. Fig. 2 is a similar view showing the parts locked in position. Fig. 3 is a longitudinal section. Fig. 4 is a Side View of the dog and Fig. 5 is a detail showing the eccentric pivot.

Referring to the drawings A represents the shank of the wrench and A the stationary jaw, each of which is provided with the teeth or serrations a and a. respectively.

B is a block or box which embraces the shank of the wrench upon which it is loosely held by a rivet a This block or box may be made in any convenient or desired shape, but that shown in the drawings I deem most convenient. Pivoted in the upper part of said box B and above the shank A is the movable jaw B which is also provided with serrations 1). Within this block B at the point I) is pivoted the dog B which has the serrations b on part of its lower side that are adapted to engage with the teeth a on the shank of the wrench. Upon the upper side of the dog is secured the flat spring b which is adapted to engage and press upon the pivoted jaw 13, for a reason which will be hereinafter stated. In one end of this dog there is an open slot 0 within which the pivot D is adapted to work. This pivot D has upon each end a bearing e of larger diameter than itself and which are adapted to work in the sides of the box. The pivot D is eccentric to the bearings 6 so that when the lever E on the side of the box is pulled down the pivot D revolves eccentrically in. the slot 0 and raises that end of the dog B This naturally lowers the opposite end and the teeth I) lock with the teeth a and hold the box in a fixed position.

Having described the various parts the operation of the wrench is as follows: The parts being in the position shown in Fig.1 it is desired to open the jaws in order to tighten a pipe or nut. The box B is pushed toward the handle till there is a sufficient space between the jaws. The lever E is then pulled down thereby raising the slotted end of the dog B and pulls the toothed end of said dog down so as to engage with the teeth a on the shank. WVhen the toothed end of the dog is lowered the point of contact of the spring on the movable jaw is shifted to a point back of the pivotal point of said jaw, thus acting to force the serrated end of the jaw B down, as shown in Fig. 2. The projection b on the movable jaw is then pressed down (as shown in dotted lines Fig. 2) so that the pipe may be inserted. When the projection'b is released the spring forces the movable jaw back upon the pipe. To release the pipe the movable jaw is opened as just described and the pipe is withdrawn. I

What I claim is-- 1. In a wrench the shank, the stationary jaw formed integral therewith, a box sliding on said shank, the movable jaw pivoted in said box and the pivoted dog having one end slotted and carrying a fiat spring adapted to contact with said movable jaw, and the eccentric pivot passing through'said slot substantially as described.

2. In a wrench the shank, the stationary jaw formed thereon, a box sliding on Said shank and carrying the pivoted jaw, the dog having the spring adapted to engage said pivoted jaw and provided in one end with the slot for the eccentric pivot to work in, substantially as described.

3. In a wrench, the shank and stationary jaw formed integral, a sliding box carrying the pivoted jaw, the dog pivoted within said box and having the spring, secured to its upper side, which is adapted to engage the piv oted jaw, the pivot D eccentrioally pivoted;

In testimony whereof I affix my signaturein presence of two vvitnesses Witnesses:

DAVID A. GANT, C. H. BROWN. 

